I like the idea of needing some research to explore a dungeon "properly." Imagine an unprepared novice simply walking into an ancient ruin and being instantly killed by some booby trap he would have been able to disarm properly had his scholars taught him about them prior. 

It's really a matter of explaining the need for the tech in the "flavor text" on the tech screen. If the writers can come up with a convincing reason for a "recruiting" tech or whatever then it seems fine. 

well i partially agree with the starter

partially cause i think its ok if some of the "top" places requires some reasearch, the most deep dungeons and stuff like that

but in general yeah, from 2a to 2b the feeling i had was "oh no i cant do this until i research it"

some adventuring should be more free to do without research while maybe research should boost the rewards, or unlock better quests/dungeon, maybe some "help", dunno a guardian spirit helping you when you fight in dungeons and stuff like that

another thing i should like is some huge long step quest but maybe ill try to make it more precise in another thread

The adventure tech tree is mostly garbage right now. I agree it does need an overhaul on how it is handled. Here is what I think it should be more like.

Explore Ruin Techs - Give you bonuses to finding more and better stuff when exploring ruins.

Quest Unlock Techs - Give you higher rewards from questing and make them spawn a lot faster.

Recruit Techs - Lower the cost to recruit heroes and possible have more heroes spawn. Or prehaps wandering heroes more likely to head towards you kingdom thus making it easier to find and hire them. Instead of having them randomly walking in the middle of no where.

Building Techs - Current ones say they let you recruit units that aren't even in the game. But I think there should be ones that give you bonuses to doing adventuring stuff. Maybe even a building that helps chance of quest/ruin spawning.

The "unlock" approach works for things like Civics and Military where new items give you the ability to produce much better stuff thus increasing your production and unit strength. But in adventure Explore/Quest stuff goes away to fast and your left with nothing to do plus it's easy for non-Adventuring focused players to pick up. Since Civics has much higher production Adventuring needs a way to increase it's income as well as maybe lower cost to stay competative. And possible some options to make it easier to equip the heroes you do recruit.